Instrument Panel Wiring

[SJTD]

I'm cleaning up the harness under the dash, getting rid up stuff I don't need.

Going to have a new instrument panel and trying to think up all the wires that'll have to go to it. So far I've come up with:

12V
Ground
Turn Signal Indicators
High Beam
Parking Brake
Gauge Lights
Fuel Level
4WD

What am I missing?

[Heep-J4000]

I'm cleaning up the harness under the dash, getting rid up stuff I don't need.

Going to have a new instrument panel and trying to think up all the wires that'll have to go to it. So far I've come up with:

12V
Ground
Turn Signal Indicators
High Beam
Parking Brake
Gauge Lights
Fuel Level
4WD

What am I missing?

Oil pressure signal light
Or maybe you go for a mechanical oil pressure gauge!?

[SJTD]

I am putting in gauges but it would be good to have oil pr and water temp lights as backups.

Thanks.

[67GMC]

On my '84, there's both an oil pressure sender and oil pressure switch already installed. The oil pressure switch was used for the choke heater I believe but it's basically a switch at the end of the day.

[SJTD]

Everything forward of the firewall is gone and original instrument panel is gone so only stuff I want will be installed.

[67GMC]

The harness still has the wires for the OP switch and sender so just giving you the idea it can be re-used. They're just wires so can be traced back to bulkhead connector and then to the IP and can be re-purposed or put back.

There's also the seat belt warning light on the IP. That light stays on until the timer times out. The timer is a small silver cylinder on the harness under the dash close to the inside fire wall. I think it has three pins on it kind of like a relay.

[SJTD]

Thanks. I am using the existing OP and the existing water temp gauge wire for the idiot lights.

Removed the seatbelt/lights/key/whatever nanny buzzer timer and associated wiring. It's the blue box mounted to the fuse panel.

I'd like to slap the guy in charge of doing the wiring diagram in the factory manual.

Where I come from a component is shown once on a diagram and if a wire from another area of diagram goes to it you either draw it in or use a flag. This thing shows some components two or three, maybe four times. Wire junctions repeated multiple times. Some components but not all in the index. Pinouts on some connectors up front, some on the face of the drawing.

Very difficult to follow. I've spent hours going through it.

[67GMC]

Yes-the wiring diagrams are a chore. The 84 diagrams look like they were hand drawn while riding in the back of a school bus.

The seatbelt light timer relay is different than the key / lights-on buzzer module. The timer is not shown on my wiring diagram at all. The buzzer is mounted on the fuse panel. If you pull the harness out, the timer is really close to the bulkhead fitting

Some years have better diagrams and there wasn't a lot changed from year to year so you can sometimes use the older ones to figure out. The '76 diagrams show what the end connectors look like which is really handy when you have lots of wires and can't remember where they go.